k3d/share/shaders/k3d_eyeball.sl:15: *   bloodcolor - color of the blood vessels
k3d/share/shaders/k3d_eyeball.sl:52:	 color bloodcolor = color(.8,.05,.05);
k3d/share/shaders/k3d_eyeball.sl:103:      Cball = mix (eyeballcolor, bloodcolor, smoothstep(0,.75,displayed));
